First, I would say that the narcissist's personal preoccupation with the SELF would be a recipe for loneliness. In fact the DSM-5 has redefined narcissism to include " impairments in personality (self and interpersonal) functioning and ...The narcissist keeps referring to others excessively[only] in order to regulate his self-esteem/ sense of self-worth) and for "self-definition (to define his identity.)" (SOURCE, http://www.selfgrowth.com/articles/narcissistic-personality-disorder-in-the-dsm-v)
See also:
Computers in Human Behavior, Volume 28, Issue 6, November 2012, Pages 2414–2419
The effects of personality traits, self-esteem, loneliness, and narcissism on Facebook use among university students;
also, see the following website: http://www.healthyplace.com/personality-disorders/malignant-self-love/articles-on-narcissism-and-the-narcissist-toc/
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